CODEWITHSUNDEEP
c++cmultithreadingthread-local-storage
Dainius
Dainius

Reputation: 1852

Use different static lib memory for win32 threads

I have some old C static lib which have code similar to:

.h file

void setValue(int);

.c file

int value;

void setValue(int i) { value = i; }

and from main app (written with c++) it's just invoked by calling (there's extern C include in header file of course)

setValue(42);

In single thread everything works just fine and of course if use same lib in 2 different threads "value" is shared between them.

What would be best way to use separate memory for that lib for every thread?

so if there would be 2 threads T1 and T2, it would work like:

T1.setValue(1); 
T2.setValue(2);
T1.start();
T2.start();

// T1 works with value "1"
// T2 works with value "2"

Upvotes: 1

Views: 93

Answers (1)

wilx
wilx

Reputation: 18228

Assuming you can change and recompile the code, you can mark the value static variable with either __thread or with thread_local (C++11) or with __declspec(thread) (MSVC). Then each thread will have a separate storage for the variable.

Upvotes: 1

Related Questions